CN105818941B - A back-sweep draft detection system and its working method - Google Patents

Abstract

The invention discloses a bottom-up scanning type draught detection system and a working method thereof. The synchronous control module consists of a reliable clock generator and a synchronous buffer circuit and is used for driving the ultrasonic sensor module and the water pressure sensor module to work synchronously, the problem that water pressure data are not matched with ultrasonic signals due to water surface fluctuation is solved, and the detection precision of the detection system is improved. The underwater mounting support module is a stainless steel support with the length smaller than the width of the navigation channel and is used for fixing the ultrasonic sensor and the water pressure sensor. The automatic lifting floating body module can adjust the underwater depth of the underwater mounting support module according to the water level change information, so that the automatic lifting floating body module is adaptive to water level change and convenient to overhaul.

Description

A back-sweep draft detection system and its working method

technical field

The invention relates to a back-sweep type draft detection system and a working method thereof, which are applied in the fields of ship draft detection, ship safety detection and the like.

Background technique

Shipping plays an increasingly significant role in driving the development of the national economy. With the continuous increase of shipping volume, the density of ships in the waterway has increased significantly. Ship draft detection is of great significance to ensure the safety of navigable ships. The existing back-sweep draft detection system uses an ultrasonic sensor to emit ultrasonic waves underwater, and calculates the draft of the ship according to the intensity of the reflected wave after hitting the hull and the installation depth of the equipment measured by the water pressure sensor.

Chinese patent CN201420644533.9 discloses a sound velocity calibration type ship draft detection system, the draft detection system is to fix the single-beam ultrasonic sensor array on the detection door, and the two ends of the detection door are suspended on the hull as a floating body (or fixed on bridges, or submerged on the bottom of the water). By transmitting ultrasonic waves to the water surface underwater and receiving ultrasonic waves, the ultrasonic flight time is multiplied by the speed of sound to obtain the distance from the detection door to the water surface, that is, the installation depth of the detection door. The sound velocity used is a fixed sound velocity value or a sound velocity value obtained through a look-up table method based on the on-site temperature. When a ship passes by, the bottom of the ship reflects ultrasonic waves, and the distance from the detection door to the ship can be obtained. The draft is the difference between the distance from the water surface to the detection door and the distance from the detection door to the ship. This method is only suitable for small water surface fluctuations. When the water surface fluctuations are large, the system has the following problems: the underwater depth of the device measured by the water pressure sensor is h ₁ , and the ultrasonic sensor starts to work after time Δt. Due to the influence of fluctuations, the underwater depth of the device becomes h ₂ at this time, and there is an error Δh=h ₂ -h ₁ , resulting in a large error in the final calculation result.

Contents of the invention

In order to solve the above-mentioned problems, the present invention provides a sweeping draft detection system and its working method in which the ultrasonic sensor and the water pressure sensor work synchronously, so as to improve the detection accuracy of the ship's draft.

Technical scheme of the present invention is as follows:

A sweeping draft detection system, comprising an automatic lifting floating body module, an underwater installation bracket module, an ultrasonic sensor module, a water pressure sensor module, a synchronous control module, an ultrasonic data acquisition module, a water pressure data acquisition module, and a data processing and display module and alarm module; the synchronous control module is connected with the ultrasonic sensor module and the water pressure sensor module respectively through the synchronous buffer circuit, and the described ultrasonic sensor module is connected to the data processing and display module through the ultrasonic data acquisition module, and the water pressure The sensor module is connected to the data processing and display module through the water pressure data acquisition module, and the data processing and display module is also connected to the alarm module;

The automatic lifting buoy module is composed of a buoy, a cable and a lifter, and is used to adjust the depth of the underwater installation bracket module; the underwater installation bracket module is a stainless steel bracket whose length is less than the width of the channel, and is used to fix the ultrasonic sensor module and water pressure sensor module; the ultrasonic sensor module is an array of ultrasonic sensors fixed at equal intervals on the underwater mounting bracket module; the water pressure sensor module is a water pressure sensor fixed on the underwater mounting bracket module; the The synchronous control module is installed on the bank of the waterway, and is connected with the ultrasonic sensor module and the water pressure sensor module respectively through the synchronous buffer circuit; the synchronous control module is composed of a reliable clock generator and a synchronous buffer circuit, which is used to drive the ultrasonic sensor module and the water pressure sensor Module synchronous work; Described ultrasonic data acquisition module is an embedded computer, is used for collecting the ultrasonic signal that ultrasonic sensor module receives; Described water pressure data acquisition module is another embedded computer, and ultrasonic data acquisition The modules are independent of each other and are used to collect the water pressure data collected by the water pressure sensor module; the data processing and display module is an industrial computer, which uses the data collected by the ultrasonic data acquisition module and the water pressure data acquisition module to calculate and display the ship The specific draft; the alarm module is used to prompt the staff to judge whether the draft of the passing ship exceeds the limit.

A working method of a back-sweep draft detection system, comprising the following steps:

A. Build an automatic lifting floating body module

The automatic lifting floating body module is composed of a floating body, a cable and an elevator; the floating body is placed in the water on both sides of the channel to fix the underwater installation bracket module; the elevator is placed on both sides of the channel and connected to the floating body through a cable to adjust the underwater installation Depth of the bracket module;

B. Build the underwater installation bracket module

The underwater installation bracket module is a stainless steel bracket whose length is less than the width of the channel, and is used to fix the ultrasonic sensor module and the water pressure sensor module, which are fixed on the floating body of the automatic lifting floating body module, and adjust the depth of the water according to actual needs;

C. Build a synchronous control module

The synchronous control module is installed on the bank of the waterway, and is respectively connected with the ultrasonic sensor module and the water pressure sensor module through the synchronous buffer circuit; the synchronous control module is composed of a reliable clock generator and a synchronous buffer circuit; The enable signal for the work of the pressure sensor module; the enable signal simultaneously drives the ultrasonic sensor module and the water pressure sensor module to work through the synchronous buffer circuit of the ultrasonic sensor module and the water pressure sensor module;

D. Build an ultrasonic data acquisition module

The ultrasonic data acquisition module is an embedded computer; when the ultrasonic sensor module is working, the ultrasonic data acquisition module collects ultrasonic signals in real time;

E. Build water pressure data acquisition module

The water pressure data acquisition module is another embedded computer, which is independent of the ultrasonic data acquisition module. When the water pressure sensor module is working, the water pressure data acquisition module collects water pressure data in real time;

F. Build data processing and display modules

The data processing and display module is an industrial computer; the distance D _max between the lowest point of the ship and the underwater installation bracket module is calculated according to the data collected by the ultrasonic data collection module; the water pressure data collected by the water pressure data collection module is used to calculate the water pressure. The distance H between the lower mounting bracket module and the water surface; finally calculate the draft of the ship as L=HD _max ;

G. Build an alarm module

The alarm module prompts the staff to judge whether the draft of the passing ship exceeds the limit according to the final calculated draft of the ship.

Compared with prior art, advantage of the present invention is as follows:

1. The present invention provides a synchronous control module, which can drive the ultrasonic sensor module and the water pressure sensor module to work synchronously. It overcomes the problem of large error between the measured water pressure data and the real-time water pressure data due to large water surface fluctuations.

2. The present invention provides a synchronous control module, which overcomes the large error between the measured water pressure data and the real-time water pressure data caused by the floating body floating up and down.

3. The present invention reduces the original measurement error range from 10-15cm to 5-10cm, improving the accuracy of the detection system.

Description of drawings

The present invention has 5 accompanying drawings, wherein:

Fig. 1 is a functional block diagram of the present invention.

Figure 2 is a schematic diagram of the underwater device.

Figure 3 is a schematic diagram of the working principle of the ultrasonic sensor.

Fig. 4 is a schematic diagram of measuring the draft of a ship.

Figure 5 is a schematic diagram of the influence of water surface fluctuations on water pressure.

In the figure: 1. Synchronous control module, 2. Ultrasonic sensor module, 3. Water pressure sensor module, 4. Ultrasonic data acquisition module, 5. Water pressure data acquisition module, 6. Data processing and display module, 7. Alarm module, 8. Underwater installation bracket module, 9. Ship, 10. Ultrasonic emission wave, 11. Ultrasonic reflection wave, 12. Automatic lifting floating body module.

detailed description

Below in conjunction with the accompanying drawings, the present invention will be further described: as shown in Figures 1-5, a sweeping draft detection system includes an automatic lifting buoy module 12, an underwater mounting bracket module 8, an ultrasonic sensor module 2, a water pressure Sensor module 3, synchronous control module 1, ultrasonic data acquisition module 4, water pressure data acquisition module 5, data processing and display module 6 and alarm module 7; Described synchronous control module 1 communicates with ultrasonic sensor module 2 respectively through synchronous buffer circuit Connect with water pressure sensor module 3, described ultrasonic sensor module 2 is connected to data processing and display module 6 through ultrasonic data acquisition module 4, described water pressure sensor module 3 is connected to data processing and display module 5 through water pressure data acquisition module Display module 6, described data processing and display module 6 is also connected with alarm module 7;

The automatic lifting floating body module 12 is composed of a floating body, a cable and an elevator, and is used to adjust the depth of the underwater installation bracket module 8; the underwater installation bracket module 8 is a stainless steel bracket whose length is less than the width of the channel, and is used to fix the ultrasonic wave. Sensor module 2 and water pressure sensor module 3; Described ultrasonic sensor module 2 is the ultrasonic sensor array that is fixed on the underwater mounting bracket module 8 at equal intervals, and the working principle is as shown in Figure 3, when the ultrasonic wave 10 hits the ship After 9, it becomes the ultrasonic reflected wave 11 and is received by the ultrasonic sensor module 2 again; the water pressure sensor module 3 is a water pressure sensor fixed on the underwater installation bracket module 8, and the water pressure sensor module 3 can detect the impact of water surface fluctuations in real time. The influence of water pressure (as shown in Figure 5) and gather water pressure data; Described synchronous control module 1 is installed on the channel bank, is connected with ultrasonic sensor module 2 and water pressure sensor module 3 respectively by synchronous buffer circuit; Synchronous control Module 1 is made up of reliable clock generator and synchronous buffer circuit, is used for driving ultrasonic sensor module 2 and water pressure sensor module 3 to work synchronously; Described ultrasonic data acquisition module 4 is an embedded computer, is used for collecting ultrasonic sensor module 2. Ultrasonic reflected wave 11 that receives; Described water pressure data acquisition module 5 is another embedded computer, is mutually independent with ultrasonic data acquisition module 4, is used for collecting the water pressure data that water pressure sensor module gathers; Described The data processing and display module 6 is an industrial computer, which uses the data collected by the ultrasonic data acquisition module 4 and the hydraulic data acquisition module 5 to calculate and display the specific draft of the ship 9; the alarm module 7 is used to prompt the staff It is judged whether the draft of the passing ship 9 exceeds the limit.

A working method of a back-sweep draft detection system, comprising the following steps:

A. Construct the automatic lifting floating body module 12

The automatic lifting floating body module 12 is composed of a floating body, a cable and an elevator; the floating body is placed in the water on both sides of the channel to fix the underwater installation bracket module 8; The depth of the lower mounting bracket module 8;

B. Build the underwater installation bracket module 8

The underwater installation bracket module 8 is a stainless steel support with a length less than the width of the channel, which is used to fix the ultrasonic sensor module 2 and the water pressure sensor module 3, which are fixed on the floating body of the automatic lifting floating body module 12, and adjust the depth of the water according to actual needs;

C. Construct synchronous control module 1

The synchronous control module 1 is installed on the bank of the waterway, and is respectively connected with the ultrasonic sensor module 2 and the water pressure sensor module 3 through the synchronous buffer circuit; the synchronous control module 1 is composed of a reliable clock generator and a synchronous buffer circuit; the reliable clock generator generates and drives ultrasonic waves The enabling signal for the sensor module 2 and the water pressure sensor module 3 to work; the enabling signal simultaneously drives the ultrasonic sensor module 2 and the water pressure sensor module 3 to work through the synchronous buffer circuit of the ultrasonic sensor module 2 and the water pressure sensor module 3 respectively;

D. Construction of ultrasonic data acquisition module 4

The ultrasonic data acquisition module 4 is an embedded computer; when the ultrasonic sensor module 2 was working, the ultrasonic data acquisition module 4 collected ultrasonic signals in real time;

E. Build water pressure data acquisition module 5

The water pressure data acquisition module 5 is another embedded computer, which is independent of the ultrasonic data acquisition module 4. When the water pressure sensor module 3 was working, the water pressure data acquisition module 5 collected water pressure data in real time;

F. Build data processing and display module 6

The data processing and display module 6 is an industrial computer; the principle of calculating the draft of the ship 9 is shown in Figure 4: the distance D _max between the lowest point of the ship 9 and the underwater installation bracket module 8 is calculated according to the data collected by the ultrasonic data acquisition module 4 ; Utilize the water pressure data collected by the water pressure data acquisition module 5 to calculate the distance H of the underwater installation bracket module 8 from the water surface; finally calculate that the draft of the ship 9 is L=HD _max ;

G. Build an alarm module 7

The alarm module 7 prompts the staff to judge whether the draft of the passing ship 9 exceeds the limit according to the finally calculated draft of the ship 9 .

Claims (2)

1. A sweeping draft detection system, characterized in that: comprising an automatic lifting buoy module (12), an underwater mounting bracket module (8), an ultrasonic sensor module (2), a water pressure sensor module (3), a synchronous control module (1), ultrasonic data acquisition module (4), water pressure data acquisition module (5), data processing and display module (6) and alarm module (7); described synchronous control module (1) passes synchronous buffer circuit Connect with ultrasonic sensor module (2) and water pressure sensor module (3) respectively, described ultrasonic sensor module (2) is connected to data processing and display module (6) through ultrasonic data acquisition module (4), described water The pressure sensor module (3) is connected to the data processing and display module (6) through the water pressure data acquisition module (5), and the data processing and display module (6) is also connected to the alarm module (7); The automatic lifting floating body module (12) is composed of a floating body, a cable and an elevator, and is used to adjust the depth of the underwater installation bracket module (8); The bracket is used to fix the ultrasonic sensor module (2) and the water pressure sensor module (3); the ultrasonic sensor module (2) is an ultrasonic sensor array fixed at equal intervals on the underwater mounting bracket module (8); the The water pressure sensor module (3) is a water pressure sensor fixed on the underwater mounting bracket module (8); the synchronous control module (1) is installed on the channel bank, and is respectively connected with the ultrasonic sensor module ( 2) It is connected with the water pressure sensor module (3); the synchronous control module (1) is composed of a reliable clock generator and a synchronous buffer circuit, and is used to drive the ultrasonic sensor module (2) to work synchronously with the water pressure sensor module (3); Described ultrasonic data acquisition module (4) is an embedded computer, is used for collecting the ultrasonic signal that ultrasonic sensor module (2) receives; Described water pressure data acquisition module (5) is another embedded computer, It is independent of each other with the ultrasonic data acquisition module (4), and is used to collect the water pressure data collected by the water pressure sensor module (3); the data processing and display module (6) is an industrial computer, and utilizes the ultrasonic data acquisition module ( 4) and the data collected by the water pressure data acquisition module (5) calculate and display the specific draft of the ship (9); the alarm module (7) is used to prompt the staff to judge whether the draft of the passing ship (9) exceeds the limit. 2. A working method of a sweeping draft detection system, characterized in that: comprising the following steps: A, build the automatic lifting floating body module (12) The automatic lifting floating body module (12) is made up of floating body, cable and elevator; The floating body is arranged in the water on both sides of the channel, and is used for fixing the underwater installation bracket module (8); Used to adjust the depth of the underwater installation bracket module (8); B. Build the underwater installation bracket module (8) The underwater installation bracket module (8) is a stainless steel support with a length less than the width of the channel, and is used to fix the ultrasonic sensor module (2) and the water pressure sensor module (3), which are fixed on the floating body of the automatic lifting floating body module (12), according to Adjust the water depth according to the actual demand; C. Build a synchronous control module (1) The synchronous control module (1) is installed on the bank of the waterway, and is respectively connected with the ultrasonic sensor module (2) and the water pressure sensor module (3) through the synchronous buffer circuit; the synchronous control module (1) is composed of a reliable clock generator and a synchronous buffer circuit ; The reliable clock generator generates an enabling signal for driving the ultrasonic sensor module (2) and the water pressure sensor module (3); the enabling signal passes through the synchronous buffer circuits of the ultrasonic sensor module (2) and the water pressure sensor module (3) respectively Simultaneously drive the ultrasonic sensor module (2) and the water pressure sensor module (3) to work; D. Build an ultrasonic data acquisition module (4) The ultrasonic data acquisition module (4) is an embedded computer; when the ultrasonic sensor module (2) was working, the ultrasonic data acquisition module (4) collected ultrasonic signals in real time; E. Build water pressure data acquisition module (5) The water pressure data acquisition module (5) is another embedded computer, which is independent of the ultrasonic data acquisition module (4). When the water pressure sensor module (3) works, the water pressure data acquisition module (5) collects the water pressure in real time. data; F. Build data processing and display module (6) The data processing and display module (6) is an industrial computer; calculate the distance D _max of the lowest point of the ship (9) from the underwater installation bracket module (8) according to the data collected by the ultrasonic data acquisition module (4); The water pressure data collected by the pressure data acquisition module (5) calculates the distance H of the underwater installation bracket module (8) from the water surface; finally deduces that the draft of the ship (9) is L=HD _max ; G. Build an alarm module (7) The alarm module (7) prompts the staff to judge whether the draft of the passing ship (9) exceeds the limit according to the finally calculated draft of the ship (9).